Trolley.



J. H. WALKER.

TROLLEY.

APPLICATION FILED JULY 7,1910.

' 1,029,408, Patented June 11, 1912.

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TROLLEY.

APPLICATION FILED JULY 7,1910.

Patented June 11, 1912.

R R M A TTORNE Y8 JOHN H. WALKER, OF LEXINGTON, KENTUCKY.

TROLLEY.

Specification of Letters Patent.

Patented June 11, 1912.

Application filed July 7, 1910. Serial No. 570,791.

To all whom it may concern;

Be it known that 1, JOHN H. WALKER, a citizen of the United States, anda resident of Lexington, in the county of Fayette and State of Kentucky,have invented certain new and useful Improvements in Trolleys, of whichthe following is a specification.

This invention is an improvement in trolleys for electric cars andrelates especially to the spring devices for holding the trolley pole upin such manner as to press its trolley against the conductor wire; andthe invention has for an object to provide a novel form of tensionspring for trolley poles in the nature of a fiat spring, as well as topro-- vide novel means of securing said spring to the pivot pin of thetrolley pole as well as to the base plate of the turn-table; and theinvention consists in certain novel constructions and combinations ofparts as will be hereinafter described and claimed.

In the drawings Figure l is a side elevation, partly in section, andFig. 2 is a top plan view of a trolley pole embodying my invention. Fig.3 is a sectional elevation illustrating the pivot pin and the partsimmediately associated therewith. Fig. 4 is a detail cross-sectionthrough the pivot pin, a portion'of the spring being shown in side view.Fig. 5 is a detail section on about line 5-5 of Fig. 3. Fig. 6 is adetail perspective view of the threaded stud.

In the construction shown, the pole A is clamped at A to its prongs Bwhich prongs are provided with bearings B which receive and encircle thepivot pin C to which the said bearings of the prongs are secured,

as more fully described hereinafter. The pin C turns in bearings D inthe bearing lugs D projecting upwardly from the turntable plate E, whichlatter is pivoted vertically at E so the trolley can swing from end toend of the car. The pin C turns freely in its bearings D in the lugs Dand the pin is of a special construction, being formed with a body ormain section C and the a threaded stud'F, as best shown in Fig. 3 o

the drawings.

The body C has a head C at one end with an angular portion C, while theother end of the said body portion is socketed at G with the base of thesocket threaded at C to receive the threaded portion F of the stud F.

The socketed end of the pivot pin is slotted longitudinally and the saidslot C extends past the middle portion of the pin so that the portion ofthe pin C lying be tween the lugs D on the turn-table or base plate,will be slotted and will receive the bent end G of the fiat spring G,which spring G fits between the lugs D, usually occupying practicallyall of the space between the said lugs and manifestly this spring may beof any suitable width, the lugs D being correspondingly spaced, in orderto secure the desired length and tension of the spring.

The threaded stud F screws into the socket C of the main section of thepivot pin and has at its outer end an angular portion F similar to thepart C of the main portion of the pin and the threaded stud F also has acupped flange F which receives the split or slotted end of the mainsection of the pin so that when the parts are assembled as shown inFigs. 1, 2 and 3, the cupped flange F 3 of the threaded stud willprevent any spreading of the slotted end of the pin within its bearingD, which might result in undue friction.

The base plate E of the turn table has an extension E projecting beyondthe pivot pin C and the lugs D are prolonged, see Figs. 1 and 2, andform at D keeper flanges on opposite sides of the spring plate D, thusaiding in retaining the said spring in its proper relation to the baseplate and the end of the spring G is bent at G under and into connectionwith the end of the base plate E as best shown in Fig. 1 of the drawing-The bearing portions B of the prongs are provided with threaded openingsH for the screws H and the body of the pin has at 1 and I sockets intowhich the point H of the screw may project when the parts are assembled,as shown in Figs. 1, 2 and 5 of the drawings. The openings I at theslotted end of the pin permit the screws H at such end of the pin to beturned in to bear against the threaded stud F in such manner as to lockthe said stud in its position in the socket C of the pin. The threadedheads F and C permit the turning of the pivot pin, when the screws H arereleased, to coil or uncoil the spring plate and vary the tensionthereof, said angular heads being adapted to receive large wrencheswhich will be useful for the purpose of adjusting the tension of thespring and when the tension of the spring is adjusted, the parts can beheld in the adjusted which spring plate is held at one end to the" baseplate or turn-table and at its other end to the pivot pin, thisconnection of the spring plate with the pivot pin being convenientlysecured by the slotted form of the pin and the threaded stud applied asbefore described.

The turn-table may preferably be of cast steel, although malleable castiron will also be found useful for the purpose.

An important feature of my invention is the flat spring plate coiled asdescribed as this construction afiords a simple, durable spring whichcan be utilized in connection with a very few parts so that it can bequickly applied and removed and can be furnished ata small cost.

Manifestly the fiat spring plate may be made of any desired width orthickness to meet the required strain in holding up the trolley pole andat the same time be sufliciently flexible to yield in pulling down thetrolley pole and adjusting the trolley to high and low conduit wires. Atthe same time the spring has a sufficient excess of sectional area tomeet any exigencies that may result from various causes, such forinstance as a lack of proper temper in the metal of the spring, thegeneral conditions of the weather, flaws in the metal, etc. It will alsobe understood that the straining of the fiber of the spring metallongitudinally around the slotted pin increases the durability of thespring in actual service over the ordinary spiral spring. In furtherexplaining this feature of my invention, it should be understood that ifthe spiral springs ordinarily used were made with an excess of sectionalarea to meet the required strains caused by the depression of thetrolley pole and to meet defects, flaws, etc., in the metal,

such springs would be so stiff and rigid from the thickness of the metalthat they would not possess the resiliency necessary in a spring supportfor a trolley pole. For this reason, the broad thin flat spring is foundof especial advantage for the purpose in view, as it can be made ofproper tension to yield under light or heavy pressure and will stillretain its elasticity notwithstanding the excess of sectional area whichmay be provided to overcome the defects, etc., as before referred to.

I claim 1. The combination of a base plate having an extension providedwith lugs having bearings, a pivot pin fitting in said bearings andcomprising a main section having an angular portion at one end andslotted from its opposite end and provided in said slotted end with athreaded socket, a threaded stud screwing in said socket and having acupped flange receiving the slotted end of the main portion of the pin,the pole prongs encircling the pin alongside the lugs of the base plate,means for securing the prongs rigidly to the pivot pin, and a flatcoiled spring held at one end in the slot of the pivot pin and woundspirally around said pin and held at its other end to the base plate,substantially as set forth.

2. In a trolley pole support, the combination of a turn table having itsbase plate extended and provided on said base plate with bearing lugsextending along the extension of the base plate, forming a groove orrecess for a spring plate, the prongs lapping alongside the lugs of theturn table, a pivot pin extending through the prongs and lugs and havinga body portion socketed in one end-and slotted longitudinally from saidend and a threaded stud screwing in said socket, and a flat spiralspring wound around the pivot pin between the lugs of the turn table andheld at one end in the slot of the said pivot pin and having its otherend bent into engagement with the edge of the base plate, substantiallyas set forth.

3. The combination of a trolley pole, a two part pivot pin thereforhaving its main portion slotted longitudinally and its other portioncupped to encircle and prevent the spreading of the split portion and aflat plate spring held at one end in the slot of the pivot pin andcoiled around the latter, substantially as set forth.

4:. The combination of a pivot pin composed of a main port-ion and athreaded stud, the main portion being socketed in one end and slottedlongitudinally from said end and the stud'being screwed in the socket ofthe main portion and having means engaging with the slotted end thereoffor preventing the spreading of such end, lugs having bearings in whichthe pivot pin may be turned, the trolley pole having its prongs providedwith bearings in which the pin may be turned, means for holding the pinfrom turning in the prongs of the pole and a spring coiled around thepivot pin and held at one end in the slot thereof, substantially as setforth.

5. The combination with a base plate having bearings for a pivot studand an extension beyond the same, of the trolley pole, a pivot pin inthe bearings of the base plate and a flat plate spring having one endbent into connection with the edge of the base plate, the other end ofthe spring being coiled around and secured to the pivot pin,substantially as set forth.

6. A base plate having bearings for a pivot pin and an extension beyondthe same and having its extension grooved in its upper face, a pivotpin, a trolley pole having its prongs held to the pivot pin and a fiatplate spring bent at one end into connection With the edge of the baseplate and seated in the groove in the upper face of said plate andhaving its other end coiled around and secured to the pivot pin,substantially as set forth.

7. The combination With a trolley pole having prongs, of a pivot pintherefor and composed of a main portion having a threaded socket in oneend and slotted longitudinally from said end and a threaded studscrewing in the socket of the main portion and having a cupped flangefitting over the slotted end of the main portion, a support havingbearing lugs for the pivot pin arranged between the prongs of the poleand a flat plate spring held at one end in the slot of the pivot pin andcoiled around said pin and suitably held at its other end, substantiallyas set forth;

JOHN H. WALKER. Witnesses:

SoLoN G. KEMoN, PERRY B. TURPIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

